package com.outsourcing.bottle.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Collections;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.widget.ImageView;

import com.aviary.android.feather.library.utils.BitmapUtils;
import com.outsourcing.bottle.BasicActivity;

public class ImageLoader {

	private int mThumbSize;
	
	private static final String TAG = ImageLoader.class.getSimpleName();
	MemoryCache memoryCache = new MemoryCache();
	public ImageFileCache fileCache;
	private Map<ImageView, String> imageViews = Collections
			.synchronizedMap(new WeakHashMap<ImageView, String>());
	ExecutorService executorService;

	public ImageLoader(Context context, String path) {
		fileCache = new ImageFileCache(context, path);
		executorService = Executors.newFixedThreadPool(10);
	}

//	final int stub_id = R.drawable.stub;

	public void DisplayImage(String url, ImageView imageView, int stub_id) {
		imageViews.put(imageView, url);
		Bitmap bitmap = memoryCache.get(url);
		if (bitmap != null){
			imageView.setImageBitmap(bitmap);
			imageView.invalidate();
		} else {
			queuePhoto(url, imageView, stub_id);
			imageView.setImageResource(stub_id);
			imageView.invalidate();
		}
	}

	public void DisplayImage(String url, ImageView imageView,int stub_id, int mThumbSize) {
		this.mThumbSize = mThumbSize;
		imageViews.put(imageView, url);
		Bitmap bitmap = memoryCache.get(url);
		if (bitmap != null) {
			imageView.setImageBitmap(bitmap);
			imageView.invalidate();
		} else {
			queuePhoto(url, imageView,stub_id);
			imageView.setImageResource(stub_id);
			imageView.invalidate();
		}
	}
	
	private void queuePhoto(String url, ImageView imageView, int stub_id) {
		PhotoToLoad p = new PhotoToLoad(url, imageView);
		executorService.submit(new PhotosLoader(p, stub_id));
	}

	private Bitmap getBitmap(String url) {
		File f = fileCache.getFile(url);

		// from SD cache
		Bitmap b = decodeFile(f);
		if (b != null){
			ServiceUtils.dout(TAG + " from SD cache:"+url);
			return b;
		}
		Bitmap bitmap = null;
		// from web
		try {
			URL imageUrl = new URL(url);
			HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();
			conn.setConnectTimeout(30000);
			conn.setReadTimeout(30000);
			conn.setInstanceFollowRedirects(true);
			InputStream is = conn.getInputStream();
			OutputStream os = new FileOutputStream(f);
			ServiceUtils.CopyStream(is, os);
			os.close();
			bitmap = decodeFile(f);
			if (null != bitmap) {
				ServiceUtils.dout(TAG + " getBitmap by url");	
			}
			return bitmap;
		} catch (Exception ex) {
			ex.printStackTrace();
			return bitmap;
		}
	}

	// decodes image and scales it to reduce memory consumption
	private Bitmap decodeFile(File f) {
		Bitmap bitmap = null;
		try {
			// decode image size
			BitmapFactory.Options o = new BitmapFactory.Options();
			o.inJustDecodeBounds = true;
			BitmapFactory.decodeStream(new FileInputStream(f), null, o);

			// Find the correct scale value. It should be the power of 2.
			final int REQUIRED_SIZE = 70;
			int width_tmp = o.outWidth, height_tmp = o.outHeight;
			int scale = 1;
			while (true) {
				if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE)
					break;
				width_tmp /= 2;
				height_tmp /= 2;
				scale *= 2;
			}

			// decode with inSampleSize
			BitmapFactory.Options o2 = new BitmapFactory.Options();
			o2.inSampleSize = scale;
			return bitmap= BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
			return bitmap;
		}
	}

	// Task for the queue
	private class PhotoToLoad {
		public String url;
		public ImageView imageView;

		public PhotoToLoad(String u, ImageView i) {
			url = u;
			imageView = i;
		}
	}

	class PhotosLoader implements Runnable {
		PhotoToLoad photoToLoad;
		int stub_id;
		PhotosLoader(PhotoToLoad photoToLoad, int stub_id) {
			this.stub_id = stub_id;
			this.photoToLoad = photoToLoad;
		}

		@Override
		public void run() {
			if (imageViewReused(photoToLoad))
				return;
			Bitmap bmp = getBitmap(photoToLoad.url);
			if (mThumbSize != 0) {
				bmp = BitmapUtils.resizeBitmap(bmp, mThumbSize, mThumbSize);
			}
			memoryCache.put(photoToLoad.url, bmp);
			if (imageViewReused(photoToLoad))
				return;
			BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad,stub_id);
//			Activity a = (Activity) photoToLoad.imageView.getContext();
			((BasicActivity) AppContext.getContext()).runOnUiThread(bd);
		}
	}

	boolean imageViewReused(PhotoToLoad photoToLoad) {
		String tag = imageViews.get(photoToLoad.imageView);
		if (tag == null || !tag.equals(photoToLoad.url))
			return true;
		return false;
	}

	// Used to display bitmap in the UI thread
	class BitmapDisplayer implements Runnable {
		Bitmap bitmap;
		PhotoToLoad photoToLoad;
        int stub_id;
		public BitmapDisplayer(Bitmap b, PhotoToLoad p, int stub_id) {
			this.stub_id = stub_id;
			bitmap = b;
			photoToLoad = p;
		}

		public void run() {
			if (imageViewReused(photoToLoad))
				return;
			if (bitmap != null) {
				photoToLoad.imageView.setImageBitmap(bitmap);
//				photoToLoad.imageView.requestFocus();
//				photoToLoad.imageView.requestFocusFromTouch();
				photoToLoad.imageView.invalidate();
				ServiceUtils.dout("BitmapDisplayer :imageView.setImageBitmap");
			} else {
				photoToLoad.imageView.setImageResource(stub_id);	
			}
		}
	}

	public void clearCache() {
		memoryCache.clear();
		fileCache.clear();
	}

}
